Magnetic Properties of the low dimensional spin system (VO)$_2$P$_2$O$_{7}$: ESR and susceptibility

TL;DR

This study investigates the magnetic properties of (VO)$_2$P$_2$O$_{7}$ using ESR and susceptibility measurements, revealing a spin gap and characterizing the spin chain interactions without phase transition evidence.

Contribution

The paper provides experimental ESR and susceptibility data for (VO)$_2$P$_2$O$_{7}$ and models its magnetic behavior with an alternating spin chain, determining key parameters like J and delta.

Findings

Determined J=51 K and delta=0.2 for the spin chain model.

Found a spin gap of approximately 6 meV from ESR.

No phase transition observed below 300 K.

Abstract

Experimental results on magnetic resonance (ESR) and magnetic susceptibility are given for single crystalline (VO)$_2$P$_2$O$_{7}$. The crystal growth procedure is briefly discussed. The susceptibility is interpreted numerically using a model with alternating spin chains. We determine $J$=51 K and $\delta$=0.2. Furthermore we find a spin gap of $\approx 6$meV from our ESR measurements. Using elastic constants no indication of a phase transition forcing the dimerization is seen below 300 K.